/in/foo.cc: In function 'void dfs(int, int, int)':
/in/foo.cc:30:30: error: 's' was not declared in this scope
             dfs(px,py,now+1);s
                              ^
/in/foo.cc:26:10: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
          if(map[px][py]=='*'||(map[px][py]=='D'&&now==t-1))
          ^~
/in/foo.cc:33:11: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
           if(flag) 
           ^~